Detector.



F. G'. SARGENT.

DETECTOR. -APPLIUATION HLED JAN.2B, 191 o Patented 3311.2, 1912.

4'UNITED sTATEsrArENT i raanamcn e. sexcam, -or Wustrow,

To all whom t may concern: l

Be it known that I, FREDERICK G. SAR- GENT, a citizen of the United States, residing at W estford, in the county of Middlesezcand State of Massachusetts, have invented a new and useful Detector, of which the following whereby the battery ordinarily employed at the receiving station can be 'dispensed with.

These objects are accomplished by the vem-` ployment of a4 detector 'consisting of a sus pended vibratory wire contactor and a contact point adapted to engage the same.

The invention also involves several improvements inthe details of construction as will appear hereinafter. f y

Reference is to be had to the accompanying drawings in whichd Figure 1 is a diagrammatic plan of a receiving station constructed in accordancef with this invention, Fig. 2 is a diagram of a modified form of wiring. Fig; 3 is an ele' vation of a modied form of detector. Fig. 4 'is an elevation of another modification of a detector coming within the scope of this invention, and Fig. 5 is an elevation of another modification.

As shown in Fig. 1 the receiving station comprises an aerial 10 for receiving the Waves provided with a tuning coil 11 having adjustable terminals whereby the resist ance can be varied. AThis aerial 1s connected with a binding post 12. With this binding post is connected an adjustable support 13 mounted on a bracket 14. Connected with this adjustable support is a resilient con-- ductor 15 formed of iron or steel and pref- `erably in the form of a flat wire, although the cross section can be varied within wide limits. It is made of soft iron or steel so as to have a capability of keeping a slight amount of residual magnetism. No external magnetic eld is used. The wire may-have Specification of Letters'latent. Application fue@ January 28', 19140.

Serial mz- 5.40.1512- more temper at one point than elsewhere if desired. Although its own resiliency isfordinarlly suicient, I have shown coil springs .29 near its ends. The opposite egd of this conductor is supported by a" clam 16 which 1s carried onthe end of a iiexib e support 17 adapted to be adjusted by a screw 18 and raam@ aan.. ma

mounted on a bracket 19. The brackets I and 19 are mounted on an dinsulating plate or slab 20. 'I he detector wire 15 is shawn this figure as provided with an oiset 21 whichduring vibration causes a slight 1011-.

gitudinal motion ofthe adjacent parts of the wlre. A detecting contact member '22 envgagles. the wire 4either at the off-set as shown 1g. 1 or in the straight longitudinallyY in vibrating art of the wire as indicated in Fig. 5. T is contact memberl may be made of carbon, carborundum, aincite, steel, iron,

silicon. or other conducting material. mounted' on a vibrating support 23 which 1s fixed on an insulated bracket 24. The member 22 is adjustably mounted on the sup: port by means of a screw 25 and nut and the support itself is capable of adjustment toward the wire 15 by a screw 26. vThe ilexible Itis spring 27 having an insulating head 28 'thereonengaging the wire 15. This is for the purpose of holding the carbon point away.y

from the wire and' lreturning' it after coherence so as to decohere thev arts, but obvioiisly this can be'accom li ed by the arf ran ement of thev resilien support 23 if de'- as a lateral vibration. In view of the fact,- that the screws 13 and 18 provide for the ad' justment of the wire l5` longitudinally as well as for the stretching or tuning thereof, 1t will be seen that the wire 15 can be moved so that the contact between the parts 21 and 22 can be made as light or heavy as may be necessary. In fact the conductor .can be moved over so that the point 22 Aengages the opposite side of the oit-set at a fresh' point. On this account the device is tuned-in two ways, one by adjustment of the wire- 15 l 80 support 23 is shown as provided witha light .l

into andv out of -contactfwith'fthe carbon point and the other by lengthening or shortening it so asto tune 'the same to the pulsa-l tions of the'make and break of the primary circuitat the primary station. The rel' silient j support 23 is electricallyjconnected with the bindingpost which is Aconnected with the ground through a condenser 31. The binding posts 12 and 30 are connected by a secondary circuit 32 which involves a potentiometer 33 and a receivmg instrument 34 shown as a telephone receiver. The potentiometerl can be wound with copper 'wire for induction or wound in the usual way for resistance and induction, and is shownas having two adjustable terminals.

I have found in practice that this -device is so sensitive that it can be successfully employed without a battery. When a b/attery 35 1s employed, it is connected up as shown in Fig. 1 so thatbyturning the `switch'37 the battery can be lincluded or the receiver can be connected between the two bindingposts preferably in series with a variable condenser 36 as shown in Fig. 2 without the battery. By proper adjustment of the parts the lcondenser can be dispensed with. 'Ihis device can be used with a telephone transmitter whenv connected up in the way in which they are usually connected.

In the -form of the invention shown in Fig. 3, the detector comprises a-resilient iron or steel member 40. This is shown as provided with an adjusting screw 41 v at one:

end capable of being turned to draw thede- `tector longitudinally and effect the contact thereof with thev carbon point 42. In this case one end of' the wire is connected by a inesteel coil spring 44 with a,stationary support 45.v An adjusting screw/43 is provided which adjusts the spring.' It-wil. be seen thatwhen the wire 40 is wound up on the screw 41 there will be a longitudinallmotion of the whole wire 4.0 which will change the point of contact thereof with the contact point 42 sothat both kinds of adjustments are secured in this case as in the form shown' in Fig. 2.

In the form shown in Fig. 4, one of these adjustments is omitted, the conducting-wire 50 being -fixed to a stationary bracket 51 at vone end and extending beyond the same.

The wire 50 in this case is very short but it has van offset 52 shown of' different shape from that illustrated in Fig. l and is connected with the sprin 53 which is adjustable by-a screw 54-ch1eiiy for aiecting the l' resiliency of the construction.

In Figf the vibrating support 23 'nas a spring 55. By rst moving the support 23 so the contact point 22 comes very close to the wire, and then adjusting the' screw, a

' very sensitive adjustment is secured.

In all the forms the lcontact point may be normally in. contact with' the conducting nwire, or when the battery is not used the contact,point may be just out of contact so thatwhen the wire vibrates they will touch.

j While I have shown and described certain preferred embodiments I- am aware that `many modifications. can. be made therein by any person skilled inthe art without departing from rthe .scope of the invention as expressed in the claims. Therefore I do not wish to'be limited to all the details shown and described but',

1. A detector for the purpose described, comprising a conductor having an olf-set therein and supported so as to vibrate when vaffected-by Hertzian waves, means forconnecting the conductor with a receiving.

aerial, and a vibratory contacting point adapted to engage the off-set portion thereofand connected with the ground.`

2. A detector for the purpose described,-

comprising a metallic resilient conductorl having a portion located at an angle to the general length of the conductor, a resiliently mounted contact point adapted to engage the conductor near said'inclined portion,

4and means for effecting a relative adjustin position to engage theconductor, with a variable pressure wherebythe pressure of the contact may be varied by said adjustments.

4. A detector for'the purpose described, comprising a conductor, means for supporting one end thereof, a resilient support at right angles to the conductor near lts opposite end to which said conductor is secured,

means for transversely adjusting the tension of said resilient support and a contact point in posltion to engage the conductor.

.5. A detector comprising a wire supported near its ends, independent means for longitudinally moving and adjusting both ends thereof and a contact point in position to engage the conductor with a contact variable'by said adjustments.

6. A detector for the purpose described, comprising a longitudinally adjustable metallic conductor resiliently supported, and

a contacting point adapted to engage said conductor and capable of vibrating transversely with respect to the direction of.l said adjustment, said conductor being free from the influence of externalmagnetic fields.

7. A detector for thepurp'ose described.l

comprising a conductorand la contact point adapted to engage the conductorysaid conductor and contact point having a relative sliding motion when the conductor vibrates. 5 8. A detector for the purposev described comprising a transversely vlbratable wire havingV a surface at an `'angle with the-direction of its length, and a contact member having a surfacesubstantiallyvparallel with 10 said surface and in light contact therewith,l

whereby when the wire vibrates there will be a slldinggmotion of one of said surfaces on the other. l.

In testimony whereof I have hereunto set my hand, in the presence of two subscribing 15 wltnesses'. v

FREDERICK G. SARGENT. Witnesses: ,l A

I-IEPHzmAH vSARGEM, MARY H. SARGENT. 

